Product Description: 5.9 inches (15 cm) ruler when opened. Magnetic bookmark with ruler function. You can use it as a bookmark by clipping it to a notebook, book, or use it as a ruler. Details: Product Size: Width 1.0 x Height 3.1 inches (25 x 80 (When opened, 1.0 inches (25 mm) x 6.3 inches (1 Foldable and Holdable magnetic bookmark with ruler function. You can hold it and sand to a book or diary. Size: W1.77" x H4.53"(S size/ 15cm ) Size: W1.77" x H6.42 "(L size/ 25cm ) Material: Magnet